The Hospital Liaison Committee are part of a large organized system called Hospital Information Services, an organized global network, run by the Watchtower Society, whose aim it is to promote blood management as the "golden standard of care" for everybody worldwide.
The HLC is not secret but a lot of their activities and motives are.
Yes, the JWs are led to believe that the HLC are "helping" them by ensuring that "they have the best medical treatment possible".
However, what the HLC is actually for is to recruit subjects for pharma companies and to promote blood management. The HLC, from the viewpoint of the JW patient themselves, are a benign group of people who "have their best interests at heart". In actuality, the HLC has the best interests of pharma companies and blood management technology manufacturers at heart. They act as recruiters for those companies.
The HLC actually came about way back in the early 70s in Canada when certain medical technologies were emerging and those technologies needed to be tested with human subjects. The HLC was piloted in Canada but then became organized in the States in the 80s by Dr. Ron Lapin and the WT with the assistance of JWs who owned insurance companies and had financial interests in hospitals.
The HLC is a training ground for blood management "specialists". The JWs who are in positions that promote blood management got their start in the HLC network. The HLC is the stepping stone for blood management professionals like Shannon Farmer, Axel Hofmann, Jan Wade, Richard Melseth and others.
So, it depends on who you ask about the HLC - the JWs, of course, see them as "helping" but so do the pharma companies who get subjects channeled into their clinical trials and such. The HLC does things like arrange for drugs (hemopure, hemolink, stantate, etc) that do not have FDA clearance to be used on JWs under "compassionate care". This way, those pharma companies can keep certain medications on the market and can keep manufacturing those drugs even if the FDA hasn t cleared them.
Do the individuals JWs and even the guys who sign up for the "local HLC visiting committee" know all this? Of course not. So, if they answer this question with platitudes for the HLC and the standard party line of "they help us", do not be surprised. Those responses are uninformed and have been programmed to be said at the local level. The local level is innocent/ignorant of what really happens with the Hospital Information Services of the Watchtower Society and what their real purpose is.